On 12/05/2016 11:43 AM, jd1008 wrote:
On 12/05/2016 10:13 AM, Samuel Sieb wrote:
> On 12/05/2016 04:18 AM, Tim wrote:
>> Allegedly, on or about 04 December 2016, Samuel Sieb sent:
>>> I haven't tried using dd to write an optical disk. I would not expect
>>> it work and it shouldn't work.
>>
>> I haven't, either. But I'd be inclined to think that it would. If your
>> ISO file is simply an image of what is going to burnt to disc, in
>> essence what will be streamed to the laser, then you shouldn't have to
>> do much beyond sending the data towards the optical device.
>>
>> The fly in the ointment would be whether a optical burner begins burning
>> when data is sent to it, or whether commands need issuing to it first
>> (and it could well be that dd isn't completely dumb, nor the device
>> handlers).
>>
> dd is "dumb" in that way, but it's possible the device driver might
> have some sort of handling. But my understanding is that there's a
> certain amount of device setup required which depends on which format
> you're writing the data in. And I think there's some sort of
> redundancy info that needs to be generated as well.
/It NEVER used to require ANY such thing./
Why has dd been wrecked?
It has always required that. Somehow you have been lucky up to now.
dd hasn't been touched. If there's been a change, it would have to be
in the kernel cdrom drivers.